Pneumatic turbine-grinder.



C. PERKINS. PNEUMATIC TURBINE GRINDER. APPLICATION FILED NOV. 20, 1914.

Patented June 15, 1915.

Fig.1. a

lm v w 6 J W 7 M x 5| W a Wiinesses.

Inventor. Charles PerKins,

Amy's.

CHARLES PERKINS, F BRIDG-EWATEB, MASSACHUSETTS.

, PNEUMATIC TURBINE-GRINDER.

' o representing like parts. I

. This invention relates to hand tools and consists of a novelconstruction of a turbine grinder..

The object of this invention is to obtain a portable and manuallyoperable power driven grinder.

Another object is to provide a rotary grinder in which the means forimparting rotation are adjacent the tool.

Another object'is to secure an easily manipulated light weightcompressed air turbine grinder. whose moving elements .are

A dirt-proof, which has few parts, and is simple in construction, andcan be produced at small expense.

In order to give an understanding of this invention, thereis illustratedin the drawings a selected embodiment of the same which will now bedescribed.

Figure 1 is a median section of the grinder; Fig. 2 is an elevationofthe parts shown in Fig. 1, looking from the right hand end, with thering plate partly broken away; Fig. 3 is a section on the line 33, Fig.1;

- Fig. 4: is a section on the line 4.-4, Fig. 2;

I This novel construction of thegrinder is formed in this selectedembodiment with a housing 1 in which is revolubly mounted a rotor shaft2 and the impulse wheel 3 -hav-' .4o ing an annular web 4 upon theperiphery 5 of which are secured the vanes 6. Radial ribs 7 are castintegral with the main housing 1 and give rigid support to the part ofthe housing containing the impulse wheel. The air intake face of thehousing is closed by means of the cover 8. The housing has cast integraltherewith the ears 9 containing threaded recesses while the cover hassimilar ears 10 bored to receive the screws 11 which are secured in'thethreaded recesses of the housing ears 9 and the cover thereby secured tothe housin The cover 8 has a central extension 12 w ich aifords abearing for the rotor shaft 2 and a housing for the air supply duct 13.This air duct13- terminates in a coupling towhich may be Specificationof Letters Patent.

Patented June 15, 1915.

Application filed November 20, 1914. Serial No. 873,124.

secured a flexible tube or other flexible means for furnishing an airsupply. The air' duct 13 terminates at its'inner end in the transverseair pipe 14 which leads in both directions to the annular channel 15 inthe cover. The ring plate 16, secured to the cover 8 by the screws 17,closes the channel 15 and thus forms an annular air pipeway.

The ports or nozzles 18 cut in the cover 8 form the means for directingthe compressed air against the vanes 6. The nozzles 18 in this selectedembod iw a o a rl 'elg nfl conical type and, as shown in Fig. 4 lead offat an angle .of approximately 20 from the air channel 15. The compressedair is thus directed tangentiallv to impinge upon the vanes 6 of theturbine wheel. There are four such nozzles shown in the accompanyingdrawings, and they are equi-distantly located in the channel 15. Thevanes 6 ofthe impulse-wheel are curved and the compressed air impingingthereon drives the wheel, the air being then exhausted through theexhaust ports 19 which are open to the atmosphere. These exhaust portsare formed by cutting narrow openings in the face of the wheel housingopposite the cover. These ports are placed a short distance beyond eachof the air intakes or nozzles andthus give the compressed air a workingdistance between the intake and the exhaust sufiicient to utilize theexpansive force of the air. I

The rotor shaft 2 terminates in a coupling 20 secured to the grindershaft 21 while the housing 1 terminates in a threaded flange 22 which issecured in a similarly threaded recess in the casing 23 of the grindershaft.

This grinder shaft projects from its casing and has a collar 24 securedthereon by a pin 25, the collar being held against the flange 26 of thegrinder shaft casing. The

shaft end 28 is threaded and a grinder 29 is slipped thereon against thewasher 30 and retained by the check nut 31. The grinder to thetransverse air-way 14 leading in two directions to the circular pipe 15.The'nozzles 18 of the diverging type permit a slight expansion of theair as it passes to the vanes 6 of the turbine wheel whereon it impingestangentially. The air has an effective working area from the .ti of thenozzle to the beginning of the a jacent and opposedly positioned exhaustports. As the successive vanes pass the exhaust ports the spent airisexhausted into the atmosphere. The turbine is mounted upon, and isrotatable with, the

rotor shaft which in turn drives, through the medium of the coupling 20,the shaft upon which the grinding surface is secured.-

There is thus produced an eflicient portable power-driven grinder whichcan be easily and eifectively operated at varying distances from thesource of power. The grinder has few elements and those which arevrotatory have dirt-proof bearings? It is compact, light and-small-inpractice, the preferable size of the wheel is from four to nine inches.The linear speed of the grinding surface is high-accomplishing the workquickly and efficiently. It is inexpensive to manufacture, not easilyderanged, and can be manipulated with facility.

. This apparatus is especiallyeflicient as a means for, brushing orscrubbing hard surfaces, as for example building and other walls and forremoving rust from iron surfaces. A stifl' wire brush may be attached,for this purpose, to the threaded shaft end. It is obvious that thistool may be'used forbuifing, boring or drilling by simply securing theappropriate tool on the threaded shaft end.

'Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is: 1:

1. A portable tool comprising a rotor, a rotor shaft, a housing. forsaid rotor, a cover for said housing, an annular conduit in saidcover, aplurality-of ports in said'cover for directing an elastic fluid to saidrotor, a plurality of exhausts in said rotor housing, an extension tosaid cover, comprising a casing for said rotor shaft and avductfordirecting an elastic fluid to said annular conduit and means forsupplying an elastic fluid under pressure to said duct.

2. A portable tool comprising a rotor, a

rotor shaft, a housing for said rotor, a cover for said housing,"anannular conduit in said cover, a plurality of ports in said conduitadjacent the periphery of said rotor for directing tangentially to itsvanes an elastic flu a plurality of complementary exhaust orifices insaid housing, said orifices 'bei'ngloifset with respect to said portswhereby an elastic fluid is 'ven an effective working istance along ti eperiphery. of said roto a duct in said cover for directing an elasticfluid to said conduit and means in said cover for aflt'ording aplurality of passages for an elastic flllld from said duct to saidconduit and means for supplying an elastic fluid under compression tosaid duct.

3. A portable power tool comprising a rotor, a rotor shaft, a housin forsaid rotor, a cover for said housing, said cover containing an annularconduit, a pipe having a plurality of passages thereto, a duct fordirecting a supply of an elastic fluid under compression to said pipeand flexible means secured to said duct whereby a supply of an orificesin said housingadjacent the side of therotor op osite said cover forexhausting the fluid an means for supplying an elastic fluid undercompression to said intake.

In testimony whereof, I have signed my CHARLES PERKINS.

Witnesses: i MAURICE W. Moons,

THQMAS J. DRUMMOND.

I name to this specification, in the presence of i two subscribingwitnesses. I

